Incorporate Conda into the release workflow

[Twixes]

We now have a Conda package too (set up by contributor @mands), defined at https://github.com/conda-forge/posthog-feedstock. But https://github.com/PostHog/posthog-python/blob/master/.github/workflows/release.yaml doesn't take it into account, which will cause the package to not be updated for Conda.

Updating the package for Conda would be just editing https://github.com/conda-forge/posthog-feedstock/blob/master/recipe/meta.yaml:

• bumping value on line {% set version = "1.4.2" %}
• updating dependencies on line requirements:

The way I understand the Conda feedstock workflow, this should be done by first updating our fork of that repo https://github.com/PostHog/posthog-feedstock, making the changes there, then making a PR from our fork to upstream, and merging that. But maybe just a commit should be enough? @posthog-bot is listed as a maintainer of the @conda-forge repo after all.